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In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A lethal recessive allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female?a.2:1 male to female d.4:3 male to femaleb.1:2 male to female e.3:1 male to femalec.1:1 male to female
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